Interesting. Looks like the rooms are sorted lexically. Easy workaround then is to prefix the room name with a number:
0=0 Lobby
1=1 Lobby-Game: Sons of Glory
2=2 Lobby-Game: Call of Combat
3=3 Lobby-Game: BattleField 1942
(For lots of rooms, use a 2-digit number with a leading zero for the first 10.)
(And yeah, I know it's not pretty.

)